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At these elevations, altitude sickness and acute mountain sickness (AMS) are possible concerns, especially for those looking to get out into nature for long periods.
Western Sìchuān endures up to 200 freezing days per year, but sunny summer days can be blistering. This, combined with the high altitude, can leave new arrivals vulnerable to bad sunburn in addition to altitude sickness. Pack layers and take a couple of days to acclimatise when you arrive and as you continue to gain elevation.